JP2006249665A - Method for tensioning/anchoring and connecting pc cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for tensioning/anchoring and connecting a PC cable when the PC cable in a deteriorated state etc. is replaced or when the PC cable is laid anew to repair and/or reinforce a bridge girder. <P>SOLUTION: In the case where the PC cable is tensioned/anchored when the plurality of PC cables for a girder bridge adopting an outer cable method are replaced or when the plurality of PC cables are laid anew to repair and/or reinforce the bridge girder, fixing parts at both the right and left ends of the PC cable serve as ends of the bridge girder; and tensioned/anchored and connected parts of the right and left PC cables are provided inside a girder end. In the tensioned/anchored and connected part, all or every some terminal ends of stranded wires of the plurality of PC cables are concurrently split and tensioned or split and tensioned from either of the right and left sides of an anchor plate by means of a jack, and anchored and fixed to the anchor plate by using a wedge. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tension / fixing connection method for a PC cable and a fixing connector.

  Conventionally, in various bridges, a concrete bridge girder that directly supports the load of automobiles, railways, etc., is always subjected to a large bending moment between fulcrum, so T-girder, box girder, truss, hollow floor slab, plate girder It is possible to construct a bridge girder by laying a PC cable on a concrete frame such as an external cable and introducing prestress, and to increase the distance between fulcrums.

  FIG. 1 is an explanatory view of a girder that adopts an external cable system according to an embodiment of the present invention and a connecting portion when the PC cable is replaced, (A) is a front sectional view, and (B) is an arrow AA. (C) is an arrow BB diagram, and FIG. 1 is also an explanatory diagram of a girder bridge adopting a conventional external cable system except for the tension / fixing connection portion at the center of the girder bridge.

  A conventional outer cable girder bridge will be described with reference to FIG. Reference numeral 100 denotes an outer cable type girder, and a bridge girder 10 having a box cross-section composed of an upper surface, both side surfaces, and a lower surface having a protruding portion in the horizontal direction is coupled in the left-right (longitudinal) direction, and the cross beams 11, 111 at both ends. Is laid with the abutment 17 as a supporting point. 14 is an intermediate partition, and a communication hole 141 is provided at the center. An inspection hole 142 is provided on the lower surface of the bridge girder, and is used by an inspector to enter the bridge girder 10 at the time of inspection / inspection. Reference numerals 12 and 121 denote fixing plates provided at the left and right beam ends.

  One end of the PC cable is fixed and fixed to the fixing plate 12 at the left spar end using a fixing tool, for example, and the other end is inserted through the through-holes 143 of the two intermediate partition walls 14, and the chest wall 171 and embankment 172 at the right end are inserted. Before being stacked, it is tensioned by a hydraulic jack outside the cross beam 111 and fixed to the fixing plate 121 using a fixing tool. The PC cable is tensioned using the fixing plates 12 and 121 and the edge of the through hole 143 of the two intermediate partition walls 14 as support points.

In the following Patent Document 1, both ends of a concrete frame in which an upper flange (2) and a lower flange (3) are joined by a web (4) are supported by fulcrums (6) with a simple PC girder (1) of an external cable system. (FIGS. 6B and 6D). In addition, a simple PC bridge (15) of an external cable system constructed by integrating a plurality of main girders (13) through a fixing wall (16) serving as a transverse girder (FIG. 7). Further, a simple PC box girder (18) of an outer cable type is constructed in which an upper floor slab (19) and a lower floor slab (20) are connected by both side slabs (21) to form a hollow box girder inside. Various outer cable type girder bridges are shown, such as those in which the end of the girder (18) is supported by a fulcrum (6) (FIG. 9).
JP 2004-270178 A

  The above-mentioned PC cable may be replaced for repair after a considerable period of time due to aging, etc. However, when trying to connect the tension / fixing connection part of the PC cable at the end of the first girder, the road In addition, a large working space is required outside the girder ends of girder bridges used as railways, that is, on the abutment / chest wall and the back part thereof.

  However, there are many places where this work space is not provided at the time of bridge construction. In addition to lengthening the construction period and increasing the cost of bringing work equipment required for replacing the PC cable to the back of the abutment / chest wall and providing work holes for tension fixation, etc., the back of the abutment / chest wall Is a discontinuous structure with the chest wall, which has high strength and rigidity, and there is a problem that the settlement of the road surface becomes large and adversely affects the safety and riding comfort of the vehicle and train. In the various external cable girder bridges disclosed in Patent Document 1, the tension / fixing connection portion of the PC cable is performed at the end of the girder.

  The present invention has been made in view of the above problems, and when replacing a PC cable and when laying a PC cable newly to repair and reinforce a bridge girder, it does not adversely affect the road surface of the road or railway. Tension / fixing connection method and fixing connection of PC cable, where only the minimum required work holes are provided on the back of the abutment / chest wall, and work equipment is brought in and tension fixing is performed inside the end of the girder It is in providing tools.

  The first invention for achieving the above object is a tension / fixing connection method when replacing a PC cable of a girder bridge adopting an external cable system or repairing / reinforcing a bridge girder by newly laying a PC cable. The left and right ends of the PC cable are fixed to the ends of the bridge girder, the left and right PC cable tension / fixing connection portions are provided inward of the girder ends, and the PC cables are tensioned at the tension / fixing connection portions. A tension / fixing connection method for a PC cable, characterized by fixing connection.

  According to a second invention, in the first invention, when the PC cable of the girder bridge adopting the outer cable system is replaced, the fixed portions at the left and right ends of the PC cable are used as the ends of the original bridge girder before the replacement. This is a characteristic tension / fixing connection method for PC cables.

  A third invention is the tension / fixing connection method for a PC cable according to the first or second invention, wherein the tension / fixation connection portion of the left and right PC cables is an internal space of a bridge girder in a central portion. is there.

  According to a fourth aspect of the present invention, in the first to third aspects of the invention, the tension / fixing connection operation of the PC cable tensions one PC cable at a time and fixes and connects to the fixing connector. This is a fixing connection method.

  According to a fifth aspect of the invention, in the first to third aspects of the invention, the tension / fixing connection operation of the PC cable tensions two PC cables at a time and fixes and connects to the fixing plate. This is a fixing connection method.

  According to a sixth aspect of the present invention, in the first to third aspects, the PC cable tension / fixing connection operation connects a plurality of PC cables, and the total number of the left and right PC cables is fixed in a disk shape. Fixing connection to the center of the plate, and the other PC cable is tensioned in a single line on the approximate circumference located outside the center of the fixing plate where all the PC cables are fixedly connected. This is a tension / fixing connection method for a PC cable.

  According to a seventh aspect of the present invention, there are provided two outer cylinders each having a wedge for fixing and fixing a PC cable and a spring receiving portion for receiving a spring pressed at the rear end face of the wedge and supporting the other end face of the spring; A connecting member having a cylindrical shape for connecting the outer cylinder of the connecting member to both ends, and an automatic fixing connecting device for a PC cable, wherein the cylindrical outer surface of the connecting member is provided with a long hole in its axial direction. A guide surface forming a substantially arc is provided from the inner surface of one end of the member to the open end of the elongated hole located at the other end of the connecting member, and the end of the PC cable is connected to one of the two outer cylinders. It has a function of automatically fixing and automatically fixing the end of the PC cable on the other of the two outer cylinders. When the end of the PC cable is pushed into the outer cylinder, the end of the PC cable is moved to the guide. Guided along the surface, outside of the connecting member An automatic fixing connector, characterized in that it is extruded.

  A first invention is a tension / fixing connection method when replacing a PC cable of a girder bridge adopting an external cable system or repairing / reinforcing a bridge girder by newly laying a PC cable. The fixed parts at both ends are the ends of the bridge girder, the tension / fixing connection part of the left and right PC cables is provided inside the girder end, the PC cable is tensioned at the tension / fixing connection part, and the fixing connection is made. Because it is a tension / fixing connection method for PC cables, it is necessary to bring the work equipment necessary for laying the PC cable to the back of the abutment / chest wall, without providing a large work hole that enables tension / fixation work. The construction period can be shortened, and it is possible to replace the aged girder bridge PC cable or repair and reinforce the bridge girder that newly lays the PC cable at a low cost. There is an effect that does not have an adverse effect on the running time of the safety and ride comfort.

  The second invention is characterized in that, in the first invention, when the PC cable of the girder bridge adopting the outer cable system is replaced, the fixed portions at the left and right ends of the PC cable are used as the ends of the original bridge girder before the replacement. Therefore, there is an effect that the replacement of the PC cable of the aged girder bridge can be performed more simply.

  A third invention is the tension / fixing connection method for a PC cable according to the first or second invention, wherein the tension / fixation connection portion of the left and right PC cables is an internal space of a bridge girder in a central portion. Therefore, there is an effect that the tension and fixing connection work of the left and right PC cables is easy. The work space is particularly large inside the bridge girder in the center, and the effect is particularly great when the work is performed by selecting a horizontal part of the PC cable.

  A fourth invention is characterized in that, in the first to third inventions, the tension / fixing connection work of the PC cable tensions each PC cable one by one and fixes the connection to the fixing connector. The invention of No. 5 is characterized in that the PC cable tension / fixing connection work tensions two PC cables at a time and fixes and connects them to the fixing plate. There is an effect that the cable can be tensioned and fixed.

  According to a sixth invention, in the first or third invention, the tension / fixing connection operation of the PC cable connects a plurality of PC cables, and the total number of the left and right PC cables is disc-shaped. The fixing plate is fixedly connected to the center portion of the fixing plate, and the other PC cable is tensioned in a row substantially on the circumference located outside the center portion of the fixing plate where all the one PC cables are fixedly connected. This is a tension / fixing connection method at the time of replacement of a PC cable characterized by fixing connection, so that there is an effect that the left and right PC cables can be tensioned / fixed at the same site in a short period of time. This is particularly effective when the number of PC cables is large.

  According to a seventh aspect of the present invention, there are provided two outer cylinders each having a wedge for fixing and fixing a PC cable and a spring receiving portion for receiving a spring pressed at the rear end face of the wedge and supporting the other end face of the spring; In the case of a cylindrical connecting member that joins the outer cylinder to both ends and the mold amount is large, the work of cutting the PC cable is not required every time the jack is replaced, so that the work efficiency is improved. A PC cable auto-fixing connector that is particularly effective when the length of the PC cable is long and the amount of elongation is large, and a long hole is provided in the axial direction on the cylindrical outer surface of the connecting member, A guide surface forming a substantially arc is provided from the inner surface of one end of the connection member to the open end of the elongated hole located at the other end of the connection member, and one of the two outer cylinders is the end of the PC cable. The other end of the two outer cylinders has a function of automatically fixing the end of the PC cable. When the end of the PC cable is pushed into the outer cylinder, the end of the PC cable is Since the automatic fixing connector is guided along the guide surface and pushed out of the connecting member, the PC cable can be easily inserted into the fixing connector, and the PC cable can be extended. Ki

  When replacing the PC cable, a large work space is required on the abutment / chest wall and the back of the abutment, but there are many places where this work space is not provided when the bridge is constructed, and there is a PC on the back of the abutment / chest wall. Providing new work holes that can be used for cable replacement, such as bringing in work equipment and fixing tension, increases the construction period and costs, and also increases the settlement of the road surface, making it safe for vehicles and trains to run This embodiment has a problem of adversely affecting performance and riding comfort, so that this embodiment is performed inside the end of the girder without providing a large working hole required when replacing the PC cable on the back of the abutment / chest wall. It is a feature.

  In other words, the outer cable type girder according to the embodiment of the present invention uses a fixing tool for the fixing plate 12 having one end on the left side as described in the background art of the conventional outer cable type girder. The other end is inserted through the through hole 143 of the two intermediate partition walls 14 and fixed to the fixing plate 121 on the right side by using a fixing tool. Is provided inside the end of the beam.

  At the back of the abutment / chest wall, the fixing tool is replaced, and a minimum number of work holes (not shown) are provided for the workers necessary to fix the PC cable with a wedge.

  After removing the PC cable that needs to be replaced, the fixing plates 12 and 121 provided on the concrete at the end of the girder are left as they are, and the ends of the left and right PC cables 15 and 16 are removed from the inside of the left and right girder ends. Are fixed to the fixing plates 12 and 121 using a fixing tool.

  The tension / fixing connection 13 of the left and right PC cables 15 and 16 is preferably horizontal in the center of the girder bridge and in the center of the bridge girder. It is better to select a part that can take up enough space. Further, a jack, a fixing connector or fixing plate, a wedge or the like may be used for the tension / fixing connection of the PC cable.

  However, the connection part of the PC cable is not limited to the central part of the girder bridge. What is necessary is just to be inside the beam end, and a place where a work space is easily secured may be appropriately selected depending on the structure of the bridge beam. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

  As described above, according to the present embodiment, the replacement of the PC cable can be realized with a short construction period and at a low cost without providing a large working hole in the back part of the abutment / chest wall, and further, the settlement of the road surface on the back part of the abutment / chest wall. The result is that it does not adversely affect the safety and ride quality of automobiles and railways.

  Further, the present embodiment can be applied not only to the replacement of the PC cable, but also to repair and reinforcement of a girder bridge using the PC cable and a bridge girder not using the PC cable.

  Hereinafter, it demonstrates in detail based on an Example.

  In this embodiment, the PC cable is replaced by a tensioning / fixing connection one by one with a pulling jack of the PC cable.

  FIG. 2 is a front view of the one-pull jack of the PC cable according to Embodiment 1 of the present invention. 3 is a side view of FIG. 2, (A) shows an arrow AA diagram, (B) shows an arrow BB diagram, and (C) shows an arrow CC diagram.

  4 is a cross-sectional view of an automatic fixing connector for fixing and connecting one left and right PC cables according to Embodiment 1 of the present invention. FIG. 4A is a cross-sectional view of a conventional fixing connector. ) Is a sectional view of the deformation type.

  2 or 3, the jack device 20 has a pair of cylinders 22, pistons 23, and rods 24 that are driven by a known hydraulic pump, and a pair of cylinders are fixed at a predetermined interval at the left end of the cylinders 22. A fixing plate 27 having a conical hole (with an opening groove on the lower side) for attaching the wedge 21 is provided. A pair of cylinders are attached to the right end of the cylinder 22 in parallel with the fixing plate 27 at a predetermined interval, and a cable is provided at the center. A fixing plate 271 with a U-shaped notch through which 26 is inserted is provided. Further, a fixing plate 272 having a conical hole (with an opening groove on the lower side) for fixing the wedge 211 is fixed to the right end of the pair of rods 24 in parallel with the fixing plate 27 and the fixing plate 271 at a predetermined interval. Is provided. Pipes 25 and 251 connected to a hydraulic pump (not shown) are provided at both ends of the cylinder 22 (FIGS. 2 and 3). The fixing plates 27 and 272 also have a function of a connection plate that fixes and holds the pair of cylinders 22 or the rods 24 at a predetermined interval. The conical holes of the fixing plates 27 and 272 are provided with an opening groove on the lower side, and when the wedge is slid, the PC cable can be attached and detached through the opening groove. The wedges 21 and 211 (the pressing spring and its pressing plate are omitted) have an automatic fixing function.

  The fixing tool 30 shown in FIG. 4 (a) is a known fixing connector, and is connected using a cylindrical connecting member 32 having two external cylinders 35 back to back and provided with external threads on the outer surface. In each of the outer cylinders 35, a wedge 31 divided into two or three parts, a spring 34 pressed by the rear end face of the wedge, and a spring receiving member 33 holding the other end of the spring are housed. When the cable 36 is inserted from the left and right, the spring 34 contracts and the wedge 31 spreads in the radial direction to allow the tip of the PC cable 36 to be inserted. On the contrary, when the PC cable 36 is pulled outward, the inner surface of the wedge 31 The wedge 31 is pulled outward by the frictional force with the outer surface of the PC cable 36 and the inner diameter is reduced, and the PC cable is held and restrained by the inner surface of the wedge 31.

  The fixing connector 301 shown in FIG. 4B is provided with a conical portion at the end of the outer cylinder 351 of the fixing connector 30 shown in FIG. 4A, and the PC cable 36 is inserted into the outer cylinder 351. The rest of the configuration is the same as that of the fixing connector 30 shown in FIG.

  Next, an operation method and operation for tensioning and fixing the left and right PC cables with the single pulling jack device 20 in FIG. 2 will be described.

  In FIG. 2, first, the front end of the PC cable 26 is inserted from the center of the wedge conical hole of the fixing plate 27 from the left side and is inserted to the center of the jack cylinder 22, and the PC cable 26 is connected by the automatic fixing function of the wedge 21. Fixed to the fixing plate 27, the tip of the PC cable 26 is pushed into one end of the fixing connector 30 (or 301, the same hereinafter), and the tip of the PC cable and the fixing connector 30 are connected by the automatic fixing function of the wedge 31. (The PC cable 26 may be inserted into the opening groove below the conical hole of the fixing plate 27 and then fixed with the wedge 21 after the PC cable 26 is connected and fixed to the fixing connector 30). In this state, the fixing connector 30 is fixed to the fixing plate 27 and the arm (not shown) connected to the fixing plate 271, and the axis of the fixing connector 30 coincides with the axis connecting the centers of the holes of the fixing plates 27 and 272 and the fixing plate 271. To fix.

  Next, the tip of the PC cable 261 is inserted from the center of the conical hole of the fixing plate 272 on the right side until the tip passes through the U-shaped notch of the fixing plate 271, and the fixing plate is fixed by the automatic fixing function of the wedge 211. 272 is fixed.

  Subsequently, when the rod 24 is contracted by operating a hydraulic pump (not shown), the PC cable 261 is pulled to the left side, and the front end of the PC cable 261 is automatically fixedly connected to the fixing connector 30 on the way. Then, the end position of the PC cable is cut and removed by a cut-off machine so that the predetermined tension force is obtained, and the drawing is fixed after being adjusted.

  If the tension of the PC cables 26 and 261 does not reach a predetermined value during the first pulling operation, the jacks are replaced and the tip of the PC cable is again placed in the position necessary to introduce the required tension. The cutting operation is adjusted so that the second and, if necessary, the third and subsequent pulling operations are performed.

  When the predetermined amount of tension is reached, the hydraulic pressure of the jack is released, the wedges 21 and 211 attached to the fixing plates 27 and 272 are removed, and the PC cables 26 and 261 and the jack device 20 that are fixedly connected are separated. Repeat the above operations to connect multiple PC cables. In this case, it is preferable that the fixing connection portions are shifted in the axial direction of the PC cable so that the fixing connection portions do not overlap at the same position, and an elastic protector is inserted at an interference portion between the PC cable and the fixing connection tool. When the fixing connector shown in FIG. 4 (b) is used, the insertion portion of the PC cable has a conical shape, so that the tip of the PC cable is displaced when the fixing connector 30 is fixed or the PC cable is tensioned. However, as long as the corner of the tip of the PC cable is within the maximum diameter of the cone, fixing and connection are possible.

  According to the method of the first embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  This embodiment relates to a fixing connector for connecting one PC cable in tension and fixing.

  FIGS. 5A and 5B are explanatory views of a fixing connector for connecting one PC cable according to the second embodiment in tension / fixing connection, where FIG. 5A is a front view and FIG. 5B is a bottom view. In FIG. 5, reference numeral 60 denotes a fixing connector, which includes a central connection member 62 and outer cylinders 65 and 651 at both ends. The connection member 62 has a cylindrical shape in which a steel pipe or a steel bar is processed and a hollow portion 621 is provided. A small-diameter portion 625 having a male screw on the outer periphery is provided at both ends, and an insertion hole 622 having a reduced inner diameter is provided at one end (right side in the figure) following the small-diameter portion 625. Is provided with an enlarged diameter portion 624 that functions as a spring receiving portion, which will be described later, and an elongated hole 623 is provided in the axial direction on the lower surface of the center portion (FIG. (B)).

  The inner surface of the end portion of the left outer cylinder 65 is provided with a female screw that is screwed with a male screw provided on the outer periphery of the end portion of the connecting member 62. Inside the wedge 61 divided into two to three parts, A spring 64 that presses the rear end face of the wedge 61 is accommodated, and a spring receiving member 63 that holds the other end of the spring 64 is fitted into the opening end of the connection member 62 in the left outer cylinder 65. A female screw that engages with a male screw provided on the outer periphery of the end of the connection member 62 is provided on the inner surface of the end of the right outer cylinder 651, and the wedge 611 and the rear end surface of the wedge 611 are pressed inside. A spring 641 is accommodated, and the above-described enlarged diameter portion 624 holds the other end of the spring 641. Both wedges 61 and 611 at both ends have an automatic fixing function.

  Reference numeral 67 denotes a steel or cast steel PC cable guide having a large arc surface 671 and an arc surface or a V-shaped surface for restricting the deviation of the PC cable in the direction perpendicular to the axis in a direction perpendicular to the large arc surface 671. A hook portion 672 is formed to hook the end portion of the hole 623 and prevent the displacement. Next, a working method and operation for tensioning and fixing using the fixing connector will be described. The jack is a single-drawing jack (FIG. 2) similar to that used in the description of the first embodiment.

  Referring to FIG. 2, first, the fixing connector 60 is disposed between the two cylinders 22 of the jack so that the left end is in contact with the fixing plate 27, and the tip of the PC cable 26 is the conical hole for the wedge of the fixing plate 27 from the left side. The PC cable 26 is inserted from the center, and the tip of the PC cable 26 is pushed into the outer cylinder 65 on the left side of the fixing connector 60 to fix the PC cable 26 to one end of the fixing connector 60 by the automatic fixing function of the wedge 61. The PC cable 26 is fixed to the fixing plate 27 by the automatic fixing function of the wedge 21 (after the PC cable 26 is connected and fixed to the fixing connector 60, the PC cable is inserted from the opening groove below the conical hole of the fixing plate 27. Then, the wedge 21 may be attached and fixed).

  Next, the tip of the PC cable 261 is inserted from the center of the conical hole of the right fixing plate 272 and the tip passes through the U-shaped notch of the fixing plate 271 and is pushed into the right outer cylinder 651 of the fixing connector 60. Then, the end of the PC cable 261 is inserted at least through the elongated hole 623 until it can be seen, or until the initial slack of the PC cables 26, 261 is eliminated, and the fixing connector 60 is inserted into the fixing connector 60 by the automatic fixing function of the wedge 611. At the same time, it is fixed to the fixing plate 272 by the automatic fixing function of the wedge 211.

  Subsequently, after confirming that the left end of the fixing connector 60 is in contact with the right end surface of the fixing plate 27 of the hydraulic jack, the hydraulic pump (not shown) is operated to contract the rod 24, and the PC cable 261 is connected. Pull the PC cable to the left and tighten the cable. The drawn PC cable 261 is sent out from the long hole 623 while being guided by the guide 67. If the tension amount of the PC cables 26, 261 does not reach a predetermined value in the first pulling operation, the jacks are replaced and the second pulling operation is performed, and if necessary, the third pulling operation is performed. .

  Note that the direction of the guide by the guide 67 of the PC cable 261 is not limited to the downward direction shown in FIG. 5, and may be appropriately leftward, rightward or upward depending on the conditions around the work place. The guide can also be fixed.

  When the predetermined amount of tension is reached, the hydraulic pressure of the jack is released, the wedges 21 and 211 attached to the fixing plates 27 and 272 are removed, the fixing-connected PC cables 26 and 261 and the jack device 20 are separated, and a long hole PC cable 261 extruded from 623 is cut at an appropriate position within the hollow portion 621 of the connecting member 62 to remove the cutting portion 662, and the guide 67 is removed to connect the end portion of the PC cable 261 to the hollow portion of the connecting member 62. In 621, anti-corrosion measures are applied to the PC cable in the hollow portion 621. Repeat the above operations to connect multiple PC cables. In this case, it is preferable that the fixing connection portion is shifted in the axial direction of the cable so that the fixing connection portions do not overlap at the same position, and an elastic protector is inserted in the interference portion between the PC cable and the fixing connection tool. When the fixing connector according to the second embodiment is used, it is easy to insert the right PC cable 261 into the fixing connector 60, and it is not necessary to cut the PC cable every time the jack is replaced. Work efficiency is improved. The effect is particularly great when the length of the PC cable is long and the elongation is large.

  Also by the method of the second embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  In the present embodiment, two PC cables and one fixing plate are used, and two PC cables are tensioned and fixedly connected to replace the PC cable.

  FIG. 6 is an explanatory view of the case of using two single-drawing jacks according to Embodiment 3 of the present invention and connecting two PC cables as a tension / fixing connection. The case of attachment is shown, and the illustration of the other one is omitted. The wedges 41 and 42 are not an automatic fixing type but a normal fixing type.

  In the third embodiment, first, the right two PC cables 46 are fixed and fixed to the fixing plate 44 by the wedge 41, and the two left PC cables 45 are fixed and fixed to the fixing plate 44 by the wedge 42, and then the PC. Two jacks 43 are attached to the tip of the cable 45.

  Next, when the two pulling jacks 43 are tensioned by applying hydraulic pressure so that they have an equal stroke, the left and right PC cables 45 and 46 are simultaneously tensioned and fixed to the fixing plate 44 by the wedges 42. Two tensions can be fixed using two jacks. By repeating this operation, a plurality of PC cables can be efficiently tensioned and fixedly connected. When the number of PC cables is an odd number, the last one tension / fixing connection work may be the tension / fixing connection work by the single pulling jack of the first embodiment. The jack 43 may be attached to the tip of the right PC cable 46 to tension the PC cable.

  Also by the method of the third embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  In this embodiment, a plurality of one-pull jacks and a single disk-shaped fixing plate are used, and a plurality of PC cables are integrated into a tension / fixing connection to replace the PC cable.

  FIG. 7 is an explanatory diagram of a case where a plurality of PC cables according to the fourth embodiment are integrated and tensioned / fixed connection is made using a plurality of jacks, and FIG. 8 is an arrow AA in FIG. The figure shows the case where one pulling jack is attached, the illustration of other hydraulic jacks is omitted, and the wedges 51 and 52 are not the automatic fixing type but the normal fixing type.

  In this embodiment, first, the total number of PC cables 55 is fixed to the center portion of the fixing plate 54 by the wedges 52.

  Then, the left PC cable 56 is fixedly held on the outside of the fixing plate 54 on which all the right PC cables are fixed by using the wedge 51, and a plurality of single-drawing jacks 53 are provided at the end of the outer cable 56. The fixing plate 54 is attached so as to be dynamically balanced with respect to the center of the fixing plate 54, and tension / fixing connection is performed. In this case, it is necessary to arrange on the circumference of a predetermined size so that the jack 53 attached to the adjacent PC cable does not interfere. When a predetermined tension force cannot be obtained by this tension / fixing connection operation, the jack is operated until the predetermined tension force is obtained, and the drawing operation is performed. When a predetermined tension force is obtained, release the hydraulic pressure of the hydraulic jack, remove the hydraulic jack, attach the removed hydraulic jack 53 to the tip of the non-tensioned PC cable 56, perform the same tensioning work as before, and remove all the PC cables. The tension work is completed (first step).

  At the stage where the work of the first step is completed, the tension of the already tensioned PC cable 56 is relaxed by the extension of the right (inner) PC cable 55. Repeat the tension work (second step). Even in the second step, the tension force is eased by the extension of the right (inner side) PC cable 55, so that the tension work after the third step is repeated as necessary to secure the necessary tension force. In order to reduce the number of steps described above, it is only necessary to increase the number of hydraulic jacks that can be used at one time in each step and reduce the number of times the hydraulic jacks are recombined. Sometimes, the tension work after the second step is not necessary.

  Also by the method of the fourth embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  In this embodiment, an old girder bridge is repaired and reinforced by newly laying a PC cable, and there is no work space for tension / fixing connection of the PC cable to the back of the abutment / chest wall. .

  FIG. 9 is an explanatory view of a case where a PC cable is newly laid and repaired / reinforced on a conventional girder bridge according to Embodiment 5 of the present invention, where (A) is a front view and (B) is an arrow A- FIG. A and (C) are BB views. This figure shows a conventional girder bridge provided with a fixing block 19, fixing plates 18, 181 and a PC cable through hole 144, and fixing plates 18 and 181 using fixing devices at the ends of the left and right PC cables 151 and 161, respectively. After fixing to, the tension girder connection part 13 is provided in the inner space of the intermediate partition wall to repair and reinforce the aged girder bridge, and the other girder bridges have the same configuration and need not be modified. Next, a repair / reinforcing work method and its operation will be described.

  Prior to the tension work of the PC cable, first, a fixing block and intermediate partition walls 14 (in this embodiment, the number of intermediate partition walls is 2) are provided with PC cable through holes 144 on the inner walls of the left and right girder ends.

  Next, one end of each of the left and right PC cables is inserted into the fixing plates 18 and 181 of the block 19 from the inside of the bridge girder to the outside (left and right direction), and is fixed using a fixing tool (not shown). The other ends of the PC cables 151 and 161 are respectively inserted into the through holes 144 of the intermediate partition wall, and the tension is fixed by the tension / fixing connection portion 13 located at the middle part of the girder bridge and the bridge girder.

  The tension fixing operation at the tension / fixing connection portion 13 may be performed by fixing the tension one by one with the single pulling jack according to the first embodiment, or using two single jacks according to the third embodiment and one fixing plate. Then, two PC cables may be connected to each other by tension and fixing, or a plurality of PC cables can be integrated by using one pulling jack according to Example 4 and one disk-shaped fixing plate. Tension / fixation connection may be used.

  The tension / fixation connection part 13 is not limited to the center part of the girder bridge and the bridge girder as in the case of replacing the PC cable. What is necessary is just to select suitably with a structure. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

  If the fixing block 19 and the intermediate partition wall PC cable through hole 144 are already provided, they may be used. In this case, it is not necessary to newly provide them.

  As described above, even when an old girder bridge is newly laid and repaired and reinforced, by installing a tension / fixing connection part in the middle part of the girder bridge, Without providing a large work hole, the construction period can be shortened and costs can be reduced, and the PC cable can be laid, and the safety of automobiles and railways due to the sinking of the road surface on the back of the abutment / chest wall, An adverse effect on the ride comfort can be prevented.

  In the third, fourth, and fifth embodiments, the method of providing the conical hole for fixing the wedge on the fixing plate has been described. However, a known sleeve type fixing device is used without providing the conical hole on the fixing plate. It can also be used.

  In addition, when using a coated cable in the above embodiment, the description of providing an anticorrosion cover in the portion where the clothing of the cable has been removed in the vicinity of the fixing connector or fixing plate is omitted, but as in the case of attaching the initial PC cable. An anti-corrosion cover can be provided.

It is explanatory drawing of the connection part at the time of the girder bridge which employ | adopted the external cable system which concerns on embodiment of this invention, and its PC cable replacement | exchange, (b) is a front view, (b) is an arrow AA figure, ( (C) is an arrow BB diagram. This figure also serves as an illustration of the conventional external cable type girder bridge except for the tension / fixation part at the center of the girder bridge. It is a front view of the single drawing jack of PC cable concerning Example 1 of the present invention. FIG. 3 is a side view of the fixing plate portion of FIG. 2, (A) is an arrow AA diagram, (B) is an arrow BB diagram, and (C) is an arrow CC diagram. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a fixing connector for fixing and connecting one PC cable according to Embodiment 1 of the present invention. FIG. It is explanatory drawing of the fixing connector which carries out tension | tensile_strength and fixing connection of one PC cable which concerns on Example 2 of this invention, (A) is a front view, (B) is a bottom view. It is explanatory drawing in the case of using two 1-drawing jacks which concern on Example 3 of this invention, and carrying out tension | tensile_strength and fixing connection by making two PC cables into a group. It is explanatory drawing in the case of uniting the several PC cable which concerns on Example 4 of this invention, and carrying out tension | tensile_strength and fixation connection using several jacks. It is an arrow AA figure of FIG. It is explanatory drawing in the case of newly laying and repairing and reinforcing a PC cable in a conventional girder bridge according to Embodiment 5 of the present invention, (A) is a front view, (B) is an arrow AA view, (C) is B-

Explanation of symbols

100, 200 ... Girder bridge (external cable type)
10, 101 ... Bridge girder 11, 111 ... Cross girder 12, 121 ... Fixing plate (girder end)
13 ... Tension / fixation connection part 14 ... Intermediate partition wall 141 ... Communication hole
142 ... Inspection hole 143, 144 ... Through hole 15, 16, 151, 161 ... PC cable 17 ... Abutment 171 ... Chest wall 172 ... Embankment 18, 181 ... Fixing plate 19 ... Block (for fixing)
20 ... Single pulling jack device 21, 211 ... Wedge 22 ... Cylinder 23 ... Piston 24 ... Rod
25, 251 ... piping 26, 261 ... PC cable 27, 272 ... fixing plate 271 ... fixing plate 30, 301 ... fixing connector (one pull)
31 ... Wedge
32 ... Connection member (sleeve)
33 ... Spring receiving member 34 ... Spring 35, 351 ... Outer cylinder 36 ... PC cable 40 ... Double pull fixing device 41, 42 ... Wedge 43 ... Jack 44 ... Fixing plate 45, 46 ... PC cable 50 ... Multi fixing device 51, 52 ... Wedge 53 ... Jack 54 ... Fixing plate 55, 56 ... PC cable 60 ... Fixing connection Tool 61,611 ... Wedge 62 ... Connecting member 621 ... Hollow part 622 ... Insertion hole 623 ... Long hole 624 ... Expanded diameter part 625 ... Small diameter part 63 ... Spring Receiving member 64, 641 ... Spring 65, 651 ... Outer cylinder 66, 661 ... PC cable 662 ... Cutting part (PC cable)
67 ... Guide 671 ... Arc surface 672 ... Hook part

The present invention relates to a tension / fixing connection method for a PC cable.

  Conventionally, in various bridges, a concrete bridge girder that directly supports the load of automobiles, railways, etc., is always subjected to a large bending moment between fulcrum, so T-girder, box girder, truss, hollow floor slab, plate girder It is possible to construct a bridge girder by laying a PC cable on a concrete frame such as an external cable and introducing prestress, and to increase the distance between fulcrums.

  FIG. 1 is an explanatory view of a girder that adopts an external cable system according to an embodiment of the present invention and a connecting portion when the PC cable is replaced, (A) is a front sectional view, and (B) is an arrow AA. (C) is an arrow BB diagram, and FIG. 1 is also an explanatory diagram of a girder bridge adopting a conventional external cable system except for the tension / fixing connection portion at the center of the girder bridge.

  A conventional outer cable girder bridge will be described with reference to FIG. Reference numeral 100 denotes an outer cable type girder, and a bridge girder 10 having a box cross-section composed of an upper surface, both side surfaces, and a lower surface having a protruding portion in the horizontal direction is coupled in the left-right (longitudinal) direction, and the cross beams 11, 111 at both ends. Is laid with the abutment 17 as a supporting point. 14 is an intermediate partition, and a communication hole 141 is provided at the center. An inspection hole 142 is provided on the lower surface of the bridge girder, and is used by an inspector to enter the bridge girder 10 at the time of inspection / inspection. Reference numerals 12 and 121 denote fixing plates provided at the left and right beam ends.

  One end of the PC cable is fixed and fixed to the fixing plate 12 at the left spar end using a fixing tool, for example, and the other end is inserted through the through-holes 143 of the two intermediate partition walls 14, and the chest wall 171 and embankment 172 at the right end are inserted. Before being stacked, it is tensioned by a hydraulic jack outside the cross beam 111 and fixed to the fixing plate 121 using a fixing tool. The PC cable is tensioned using the fixing plates 12 and 121 and the edge of the through hole 143 of the two intermediate partition walls 14 as support points.

In the following Patent Document 1, both ends of a concrete frame in which an upper flange (2) and a lower flange (3) are joined by a web (4) are supported by fulcrums (6) with a simple PC girder (1) of an external cable system. (FIGS. 6B and 6D). In addition, a simple PC bridge (15) of an external cable system constructed by integrating a plurality of main girders (13) through a fixing wall (16) serving as a transverse girder (FIG. 7). Further, a simple PC box girder (18) of an outer cable type is constructed in which an upper floor slab (19) and a lower floor slab (20) are connected by both side slabs (21) to form a hollow box girder inside. Various outer cable type girder bridges are shown, such as those in which the end of the girder (18) is supported by a fulcrum (6) (FIG. 9).
JP 2004-270178 A

  The above-mentioned PC cable may be replaced for repair after a considerable period of time due to aging, etc. However, when trying to connect the tension / fixing connection part of the PC cable at the end of the first girder, the road In addition, a large working space is required outside the girder ends of girder bridges used as railways, that is, on the abutment / chest wall and the back part thereof.

  However, there are many places where this work space is not provided at the time of bridge construction. In addition to lengthening the construction period and increasing the cost of bringing work equipment required for replacing the PC cable to the back of the abutment / chest wall and providing work holes for tension fixation, etc., the back of the abutment / chest wall Is a discontinuous structure with the chest wall, which has high strength and rigidity, and there is a problem that the settlement of the road surface becomes large and adversely affects the safety and riding comfort of the vehicle and train. In the various external cable girder bridges disclosed in Patent Document 1, the tension / fixing connection portion of the PC cable is performed at the end of the girder.

The present invention has been made in view of the above problems, and when replacing a PC cable and when laying a PC cable newly to repair and reinforce a bridge girder, it does not adversely affect the road surface of the road or railway. Provide a PC cable tension / fixation connection method in which only the minimum required number of operator holes are provided on the back of the abutment / chest wall, and work such as bringing in work equipment and fixing tension are performed inside the beam end. There is.

The first invention for achieving the above object is to replace a plurality of PC cables of a girder bridge adopting an external cable system, or to repair and reinforce a bridge girder by newly laying a plurality of PC cables. A tension / fixing connection method, in which the left and right ends of the PC cable are fixed at the ends of the bridge girder, and the left / right PC cable tension / fixing connection is provided inward of the girder end. The stranded wire terminal portions of the plurality of PC cables are tensioned by splitting them all at the same time or every several pieces with a jack from one of the left and right sides of the fixing plate, and fixing and connecting the wedges to the fixing plate. This is a PC cable tension / fixation connection method.

The second invention is the first invention, and the outer cable scheme end fixed site to replace the previous original bridge girder of the left and right ends of the PC cable at a plurality of PC cable adopted girder bridge replacement Tension / fixation connection method for PC cables characterized in that, in the first or second invention, the tension / fixation connection portion of the left and right PC cables is the internal space of the bridge girder in the center. This is a tension / fixing connection method for a PC cable.

According to a fourth invention , in the first to third inventions, the fixing plate has a prismatic shape, the left and right PC cables are each composed of two, and the two of the two fixing cables are jacked from one side of the fixing plate. A PC cable tension / fixing connection method characterized by tensioning a PC cable and fixing / connecting a wedge to the fixing plate .
According to a fifth invention, in the invention of the first to third, wherein the fixing plate is a circle-shaped, fixed connect the total number of said one of the left and right PC cable in the center of the disc-shaped fixing plate, the other PC cables are arranged in a row on the outer circumference of the PC cable fixedly connected to the entire number of the one PC cables, and all the twisted wire end portions of the cables arranged on the outside are arranged at the same time or every several cables. The PC cable is tensioned / fixed and connected to the fixing plate, and is fixed and connected to the fixing plate .

The first invention is a tension / fixed connection method when replacing a plurality of PC cables of a girder bridge adopting an external cable system or repairing and reinforcing a bridge girder by newly laying a plurality of PC cables. Te, the fixed portion of the left and right ends of the PC cable and the ends of the bridge girder, provided tension-fixing connecting portions of the left and right PC cable inwardly digit edge, in the tension-fixing connecting portion, said plurality of PC cable Tensioning / fixing connection of PC cable, characterized in that all stranded wire end portions are tensioned by jacking from the left or right side of the fixing plate at the same time or divided into several pieces, and the wedge is fixed and connected to the fixing plate Because it is a method, work equipment required for laying PC cables on the back of the abutment / chest wall is not required, and a large work hole that enables tension / fixation work is not provided. It is possible to replace a PC cable of an aged girder bridge or repair and reinforce a bridge girder that newly lays a PC cable, and further, it may adversely affect the safety and riding comfort of vehicles and trains due to road sinking. There is no effect. Since it is a wedge fixing and connecting type, even when the cable length is long and the amount of cable extension due to the tension force is large, the tension amount is not limited and the specified tension force can be easily applied by changing the jack. can do.

The second invention is the first invention, and the outer cable scheme end fixed site to replace the previous original bridge girder of the left and right ends of the PC cable at a plurality of PC cable adopted girder bridge replacement Since it is the tension / fixing connection method of the PC cable characterized by the above, there is an effect that the PC cable of the aged girder bridge can be replaced more easily.

  A third invention is the tension / fixing connection method for a PC cable according to the first or second invention, wherein the tension / fixation connection portion of the left and right PC cables is an internal space of a bridge girder in a central portion. Therefore, there is an effect that the tension and fixing connection work of the left and right PC cables is easy. The work space is particularly large inside the bridge girder in the center, and the effect is particularly great when the work is performed by selecting a horizontal part of the PC cable.

According to a fourth invention , in the first to third inventions, the fixing plate has a prismatic shape, the left and right PC cables are each composed of two, and the two of the two fixing cables are jacked from one side of the fixing plate. Tightening / fixing connection of the left and right PC cables can be done easily with a simple device because it is a tensioning / fixing connection method of the PC cable characterized by tensioning the PC cable and fixing / connecting it to the fixing plate. effective.

Fifth invention, in the first or third invention, the fixing plate forms a disk shape, and fixing connecting all of said one of the left and right PC cable in the center of the disc-shaped fixing plate, the other The PC cables are arranged in a single row on the outer circumference of the PC cable fixedly connected to the entire number of the one PC cable, and all or a plurality of stranded end portions of the cables arranged on the outside are arranged simultaneously. Since this is a PC cable tension / fixing connection method characterized in that it is tensioned separately for each fixing and wedge fixing / connecting to the fixing plate. There is an effect that can be done. This is particularly effective when the number of PC cables is large.

  When replacing the PC cable, a large work space is required on the abutment / chest wall and the back of the abutment, but there are many places where this work space is not provided when the bridge is constructed, and there is a PC on the back of the abutment / chest wall. Providing new work holes that can be used for cable replacement, such as bringing in work equipment and fixing tension, increases the construction period and costs, and also increases the settlement of the road surface, making it safe for vehicles and trains to run This embodiment has a problem of adversely affecting performance and riding comfort, so that this embodiment is performed inside the end of the girder without providing a large working hole required when replacing the PC cable on the back of the abutment / chest wall. It is a feature.

  In other words, the outer cable type girder according to the embodiment of the present invention uses a fixing tool for the fixing plate 12 having one end on the left side as described in the background art of the conventional outer cable type girder. The other end is inserted through the through hole 143 of the two intermediate partition walls 14 and fixed to the fixing plate 121 on the right side by using a fixing tool. Is provided inside the end of the beam.

  At the back of the abutment / chest wall, the fixing tool is replaced, and a minimum number of work holes (not shown) are provided for the workers necessary to fix the PC cable with a wedge.

After removing the PC cable that needs to be replaced, the fixing plates 12 and 121 provided on the concrete at the end of the girder are in their original positions, and the ends of the left and right PC cables 15 and 16 are removed from the inside of the left and right girder ends. Are fixed to the fixing plates 12 and 121 using a fixing tool.

  The tension / fixing connection 13 of the left and right PC cables 15 and 16 is preferably horizontal in the center of the girder bridge and in the center of the bridge girder. It is better to select a part that can take up enough space. Further, a jack, a fixing connector or fixing plate, a wedge or the like may be used for the tension / fixing connection of the PC cable.

  However, the connection part of the PC cable is not limited to the central part of the girder bridge. What is necessary is just to be inside the beam end, and a place where a work space is easily secured may be appropriately selected depending on the structure of the bridge beam. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

  As described above, according to the present embodiment, the replacement of the PC cable can be realized with a short construction period and at a low cost without providing a large working hole in the back part of the abutment / chest wall, and further, the settlement of the road surface on the back part of the abutment / chest wall. The result is that it does not adversely affect the safety and ride quality of automobiles and railways.

In addition, since it is a wedge fixing and connecting type, even if the cable length is long and the amount of cable extension due to the tension force is large, the tension amount is not limited, and the predetermined tension force can be easily changed by changing the jack. Can be granted.

Further, the present embodiment can be applied not only to the replacement of the PC cable, but also to repair and reinforcement of a girder bridge using the PC cable and a bridge girder not using the PC cable.

  Hereinafter, it demonstrates in detail based on an Example.

  In the present embodiment, two PC cables and one fixing plate are used, and two PC cables are tensioned and fixedly connected to replace the PC cable.

  FIG. 2 is an explanatory diagram of the case of using two single-drawing jacks according to Embodiment 1 of the present invention and connecting two PC cables as a tension / fixing connection. The case of attachment is shown, and the illustration of the other one is omitted. The wedges 41 and 42 are not an automatic fixing type but a normal fixing type.

In the first embodiment , first, the right two PC cables 46 are fixed and fixed to the fixing plate 44 by the wedge 41, and the left two PC cables 45 are fixed and fixed to the fixing plate 44 by the wedge 42, and then the PC. Two jacks 43 are attached to the tip of the cable 45.

  Next, when the two pulling jacks 43 are tensioned by applying hydraulic pressure so that they have an equal stroke, the left and right PC cables 45 and 46 are simultaneously tensioned and fixed to the fixing plate 44 by the wedges 42. Two tensions can be fixed using two jacks. By repeating this operation, a plurality of PC cables can be efficiently tensioned and fixedly connected. When the number of PC cables is an odd number, the last one tension / fixing connection work may be the tension / fixing connection work by the single pulling jack of the first embodiment. The jack 43 may be attached to the tip of the right PC cable 46 to tension the PC cable.

  Also by the method of the third embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  In this embodiment, a plurality of one-pull jacks and a single disk-shaped fixing plate are used, and a plurality of PC cables are integrated into a tension / fixing connection to replace the PC cable.

FIG. 3 is an explanatory diagram of a case where a plurality of PC cables according to the second embodiment are integrated and tension / fixing connection is made using a plurality of jacks, and FIG. 4 is a view taken along line AA in FIG. The figure shows the case where one pulling jack is attached, the illustration of other hydraulic jacks is omitted, and the wedges 51 and 52 are not the automatic fixing type but the normal fixing type.

  In this embodiment, first, the total number of PC cables 55 is fixed to the center portion of the fixing plate 54 by the wedges 52.

  Then, the left PC cable 56 is fixedly held on the outer side of the fixing plate 54 to which all the right PC cables are fixed by using the wedge 51, and a plurality of single-drawing jacks 53 are provided at the end of the outer cable 56. The fixing plate 54 is attached so as to be dynamically balanced with respect to the center of the fixing plate 54, and tension / fixing connection is performed. In this case, it is necessary to arrange on the circumference of a predetermined size so that the jack 53 attached to the adjacent PC cable does not interfere. When a predetermined tension force cannot be obtained by this tension / fixing connection operation, the jack is operated until the predetermined tension force is obtained, and the drawing operation is performed. When a predetermined tension force is obtained, release the hydraulic pressure of the hydraulic jack, remove the hydraulic jack, attach the removed hydraulic jack 53 to the tip of the non-tensioned PC cable 56, and perform the same tensioning work as before. The tension work is completed (first step).

  At the stage where the work of the first step is completed, the tension of the already tensioned PC cable 56 is relaxed by the extension of the right (inner) PC cable 55. Repeat the tension work (second step). Even in the second step, the tension force is eased by the extension of the right (inner side) PC cable 55, so that the tension work after the third step is repeated as necessary to secure the necessary tension force. In order to reduce the number of steps described above, it is only necessary to increase the number of hydraulic jacks that can be used at one time in each step and reduce the number of times the hydraulic jacks are recombined. Sometimes, the tension work after the second step is not necessary.

Also by the method of the second embodiment, the PC cable can be replaced without providing a large working hole on the back surface of the abutment / chest wall.

  In this embodiment, an old girder bridge is repaired and reinforced by newly laying a PC cable, and there is no work space for tension / fixing connection of the PC cable to the back of the abutment / chest wall. .

FIGS. 5A and 5B are explanatory views when a PC cable is newly laid and repaired / reinforced on a conventional girder bridge according to Embodiment 3 of the present invention. FIG. 5A is a front view, and FIG. FIG. A and (C) are BB views. This figure shows a conventional girder bridge provided with a fixing block 19, fixing plates 18, 181 and a PC cable through hole 144, and fixing plates 18 and 181 using fixing devices at the ends of the left and right PC cables 151 and 161, respectively. After fixing to, the tension girder connection part 13 is provided in the inner space of the intermediate partition wall to repair and reinforce the aged girder bridge, and the other girder bridges have the same configuration and need not be modified. Next, a repair / reinforcing work method and its operation will be described.

  Before the tension work of the PC cable, first, a fixing block 19 and intermediate partition walls 14 (in this embodiment, the number of intermediate partition walls is 2) are provided with PC cable through holes 144 on the inner surfaces of the side walls of the left and right beams.

  Next, one end of each of the left and right PC cables is inserted into the fixing plates 18 and 181 of the block 19 from the inside of the bridge girder to the outside (left and right direction), and is fixed using a fixing tool (not shown). The other ends of the PC cables 151 and 161 are respectively inserted into the through holes 144 of the intermediate partition wall, and the tension is fixed by the tension / fixing connection portion 13 located at the middle part of the girder bridge and the bridge girder.

The tension fixing operation in the tension / fixing connection portion 13 may be performed by using two one-drawing jacks according to the first embodiment and one fixing plate to connect two PC cables to each other. Further, a single pulling jack according to the second embodiment and a single disk-shaped fixing plate may be used to integrally tension and fix a plurality of PC cables.

  The tension / fixation connection part 13 is not limited to the center part of the girder bridge and the bridge girder as in the case of replacing the PC cable. What is necessary is just to select suitably with a structure. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

  If the fixing block 19 and the intermediate partition wall PC cable through hole 144 are already provided, they may be used. In this case, it is not necessary to newly provide them.

  As described above, even when an old girder bridge is newly laid and repaired and reinforced, by installing a tension / fixing connection part in the middle part of the girder bridge, Without providing a large work hole, the construction period can be shortened and costs can be reduced, and the PC cable can be laid, and the safety of automobiles and railways due to the sinking of the road surface on the back of the abutment / chest wall, An adverse effect on the ride comfort can be prevented.

In the first to third embodiments , the method of providing the conical hole for fixing the wedge on the fixing plate has been described. However, a known sleeve type fixing tool is used without providing the conical hole on the fixing plate. You can also.

  In addition, when using a coated cable in the above embodiment, the description of providing an anticorrosion cover in the portion where the clothing of the cable has been removed in the vicinity of the fixing connector or fixing plate is omitted, but as in the case of attaching the initial PC cable. An anti-corrosion cover can be provided.

It is explanatory drawing of the connection part at the time of the girder bridge which employ | adopted the external cable system which concerns on embodiment of this invention, and its PC cable replacement | exchange, (b) is a front view, (b) is an arrow AA figure, ( (C) is an arrow BB diagram. This figure also serves as an illustration of the conventional external cable type girder bridge except for the tension / fixation part at the center of the girder bridge. It is explanatory drawing in the case of using two 1-drawing jacks which concern on Example 1 of this invention, and carrying out tension | tensile_strength and fixing connection by making two PC cables into a group. It is explanatory drawing in the case of uniting the multiple PC cable which concerns on Example 2 of this invention, and carrying out tension | tensile_strength and fixing connection using several jacks. It is an arrow AA figure of FIG. It is explanatory drawing in the case of newly laying PC cable in the conventional girder bridge which concerns on Example 3 of this invention, and repairing and reinforcing, (I) is a front view, (B) is an arrow AA figure, (C) is an arrow BB diagram.

Explanation of symbols

100, 200 ... Girder bridge (external cable type)
10, 101 ... Bridge girder 11, 111 ... Cross girder 12, 121 ... Fixing plate (girder end)
13 ... Tension / fixation connection part 14 ... Intermediate partition wall 141 ... Communication hole
142 ... Inspection hole 143, 144 ... Through hole 15, 16, 151, 161 ... PC cable 17 ... Abutment 171 ... Chest wall 172 ... Embankment 18, 181 ... Fixing plate 19 ... Block (for fixing)
40: Double pulling fixing device 41, 42 ... Wedge 43 ... Jack 44 ... Fixing plate 45, 46 ... PC cable 50 ... Multi fixing device 51, 52 ... Wedge 53 ... Jack 54 ... Fixing plate 55, 56 ... PC cable

The first invention is a tension / fixing connection method when replacing a plurality of PC cables of a girder bridge adopting an external cable system or repairing and reinforcing a bridge girder by newly laying a plurality of PC cables . The left and right ends of the PC cable are fixed at the ends of the bridge girder, the left and right PC cable tension / fixing connection portions are provided inwardly of the end of the girder, and the stranded end portions of the plurality of PC cables are connected to the fixing plate. Tension / fixing connection method for PC cables that are tensioned by jacking from the left or right side at the same time or divided into several pieces, and fixed to the fixing plate by wedges , the fixing plate having a thick plate shape the left and right PC cable is composed of two each, PC cable to a jack from one side of the fixing plate, and tension the two PC cable, characterized by fixing fixed to the fixing plate by wedge It is a tension and fixing the connection method Le.
The second invention is a tension / fixing connection method when replacing a plurality of PC cables of a girder bridge adopting an external cable system or repairing and reinforcing a bridge girder by newly laying a plurality of PC cables. The left and right ends of the PC cable are fixed at the ends of the bridge girder, the left and right PC cable tension / fixing connection portions are provided inwardly of the end of the girder, and the stranded end portions of the plurality of PC cables are connected to the fixing plate. A PC cable tensioning / fixing connection method in which all the cables are tensioned at the same time or divided into several by a jack from one of the left and right sides, and fixed to the fixing plate by a wedge to be fixed to the fixing plate, wherein the fixing plate is a disc The entire number of the left and right PC cables is fixedly connected to the central portion of the disk-shaped fixing plate, and the other PC cable is positioned outside the entire number of the one PC cables fixedly connected. On the circumference, One was placed in a row, by dividing the strand end portions of the cable disposed on the outer side all at the same time or every several tense, tension PC cable, characterized in that the fixing fixed to the fixing plate by wedge・ Fixed connection method.

The first invention is a tension / fixing connection method when replacing a plurality of PC cables of a girder bridge adopting an external cable system or repairing and reinforcing a bridge girder by newly laying a plurality of PC cables . The left and right ends of the PC cable are fixed at the ends of the bridge girder, the left and right PC cable tension / fixing connection portions are provided inwardly of the end of the girder, and the stranded end portions of the plurality of PC cables are connected to the fixing plate. Tension / fixing connection method of PC cable which is fixed and fixed to the fixing plate by wedges, and is fixed to the fixing plate by wedges at the same time or divided into several by jacks from one side of the left and right, the fixing plate having a thick plate shape, the left and right PC cable is composed of two each, PC cable to a jack from one side of the fixing plate, and tension the two PC cable, characterized by fixing fixed to the fixing plate by wedge Tension - because fixing a connection method, a simple device, there is an effect that it is tension-fixing work of the left and right PC cable easily.

The second invention is a tension / fixing connection method when replacing a plurality of PC cables of a girder bridge adopting an external cable system or repairing and reinforcing a bridge girder by newly laying a plurality of PC cables . The left and right ends of the PC cable are fixed at the ends of the bridge girder, the left and right PC cable tension / fixing connection portions are provided inwardly of the end of the girder, and the stranded end portions of the plurality of PC cables are connected to the fixing plate. Tension / fixing connection method for PC cables that are tensioned by jacking from the left or right side at the same time or divided into several pieces, and fixed to the fixing plate by wedges , wherein the fixing plate has a disk shape The entire number of the left and right PC cables is fixedly connected to the central portion of the disk-shaped fixing plate, and the other PC cable is positioned on the outer circumference of the entire number of the one PC cables fixedly connected. And in a row Location and, tense by dividing the strand end portions of the cable disposed on the outer side all at the same time or every several tension-fixing method for connecting PC cable, characterized in that the fixing fixed to the fixing plate by wedge Therefore, there is an effect that the right and left PC cables can be tensioned and fixed in the same part in a short time. This is particularly effective when the number of PC cables is large.

In addition, since it is fixed to the fixing plate with wedges , even if the cable length is long and the amount of cable extension due to tension is large, the amount of tension is not limited, and the predetermined tension can be obtained by replacing the jack. Power can be easily applied.

Claims (7)

  This is a tension / fixed connection method when replacing the PC cable of a girder bridge that adopts an external cable method or when laying and repairing a bridge girder by newly laying a PC cable. PC cable tension / fixing connection is provided by connecting the tension / fixing connection part of the left and right PC cables to the inside of the end of the spar and tensioning the PC cable at the tension / fixing connection part. Fixing connection method.   2. The PC cable according to claim 1, wherein when the PC cable of the girder bridge adopting the outer cable system is replaced, the fixing portions at the left and right ends of the PC cable are the ends of the original bridge girder before the replacement. Tension / fixation connection method.   The tension / fixation connection method for PC cables according to claim 1 or 2, wherein the tension / fixation connection portion of the left and right PC cables is an internal space of a bridge girder in a central portion.   4. The PC cable tension / fixing connection method according to claim 1, wherein the PC cable tension / fixing connection operation tensions one PC cable at a time and fixes the PC cable to a fixing connector.   4. The tension / fixing connection method for a PC cable according to claim 1, wherein the PC cable tension / fixing connection operation is performed by tensioning two PC cables and fixing the PC cable to the fixing plate.   The tension / fixing connection operation of the PC cable is to connect a plurality of PC cables, and all of the left and right PC cables are fixedly connected to the center of the disk-shaped fixing plate, and the other PC cable is connected 4. The fixing connection is performed by tensioning in a single line on a substantially circumference located outside a central portion of a fixing plate to which all the one PC cables are fixedly connected. PC cable tension / fixation connection method. Two outer cylinders each having a wedge for fixing and fixing a PC cable and a spring receiving portion for supporting the other end surface of the spring which accommodates a spring pressed at the rear end surface of the wedge;
A PC cable auto-fixing connector comprising a cylindrical connecting member for coupling the two outer cylinders to both ends,
A long hole is provided in the axial direction on the cylindrical outer surface of the connection member, and a substantially circular arc is formed from the inner surface of one end of the connection member to the open end of the long hole located at the other end of the connection member. A guide surface is provided, and one of the two outer cylinders has a function of automatically fixing the end of the PC cable, and the other of the two outer cylinders has a function of automatically fixing the end of the PC cable. An automatic fixing connector, wherein when an end of a cable is pushed into the outer cylinder, the end of the PC cable is guided along the guide surface and pushed out of the connecting member.

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